diff options
Diffstat (limited to 'nuttx/drivers')
| -rw-r--r-- | nuttx/drivers/mmcsd/mmcsd_spi.c | 10 | ||||
| -rw-r--r-- | nuttx/drivers/mtd/at25.c | 16 |
2 files changed, 16 insertions, 10 deletions
diff --git a/nuttx/drivers/mmcsd/mmcsd_spi.c b/nuttx/drivers/mmcsd/mmcsd_spi.c index d437b7fea..3d4cf1dd1 100644 --- a/nuttx/drivers/mmcsd/mmcsd_spi.c +++ b/nuttx/drivers/mmcsd/mmcsd_spi.c @@ -1,7 +1,7 @@ /**************************************************************************** * drivers/mmcsd/mmcsd_spi.c * - * Copyright (C) 2008-2010, 2011-2012 Gregory Nutt. All rights reserved. + * Copyright (C) 2008-2010, 2011-2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt <gnutt@nuttx.org> * * Redistribution and use in source and binary forms, with or without @@ -409,10 +409,14 @@ static uint32_t mmcsd_sendcmd(FAR struct mmcsd_slot_s *slot, int ret; int i; - /* Wait until the card is not busy */ + /* Wait until the card is not busy. Some SD cards will not enter the IDLE + * state until CMD0 is sent for the first time, switching the card to SPI + * mode. Having a pull-up resistor on MISO may avoid this problem, but + * this check makes it work also without the pull-up. + */ ret = mmcsd_waitready(slot); - if (ret != OK) + if (ret != OK && cmd != &g_cmd0) { return ret; } diff --git a/nuttx/drivers/mtd/at25.c b/nuttx/drivers/mtd/at25.c index e35b794a5..c58b16122 100644 --- a/nuttx/drivers/mtd/at25.c +++ b/nuttx/drivers/mtd/at25.c @@ -691,14 +691,16 @@ FAR struct mtd_dev_s *at25_initialize(FAR struct spi_dev_s *dev) kfree(priv); priv = NULL; } - - /* Unprotect all sectors */ + else + { + /* Unprotect all sectors */ - at25_writeenable(priv); - SPI_SELECT(priv->dev, SPIDEV_FLASH, true); - (void)SPI_SEND(priv->dev, AT25_WRSR); - (void)SPI_SEND(priv->dev, AT25_SR_UNPROT); - SPI_SELECT(priv->dev, SPIDEV_FLASH, false); + at25_writeenable(priv); + SPI_SELECT(priv->dev, SPIDEV_FLASH, true); + (void)SPI_SEND(priv->dev, AT25_WRSR); + (void)SPI_SEND(priv->dev, AT25_SR_UNPROT); + SPI_SELECT(priv->dev, SPIDEV_FLASH, false); + } } /* Return the implementation-specific state structure as the MTD device */ |